Discontinued

Dual-Bay 2.5in Hard Drive Enclosure - USB 3.0 to SATA III 6Gbps with RAID

One high performance storage solution to support two SSD or HDD drives

Product ID: S252BU33R

3.6 stars (5 reviews) |
  • Create a powerful external USB 3.0 storage solution, supporting two 2.5" SSD or HDD drives
  • Sleek, compact design works beautifully with your Mac or PC
  • Transfer files quickly with SATA III (6Gbps) power and USB 3.0 with UASP

This USB 3.0 2-bay enclosure for 2.5in drives gives you the performance you want in an external storage system - and features a stylish, compact design that looks great next to your Mac or PC.  Ideal for professional business settings or home offices, it provides a powerful data storage solution for your desktop computer, laptop, Ultrabook™ or Chromebook™.

High capacity, high performance external storage

The dual drive enclosure lets you install two 2.5in SSDs or HDDs (from 5mm to 15mm) to create high capacity external data storage. To maximize the performance and speed of your SATA III (6Gbps) drives, the enclosure is enhanced with UASP delivering up to 70% faster transfer speeds than conventional USB 3.0. (See testing results below.) 

Sleek, compact design with flexible power options

With its compact design and small footprint, this high performance 2-bay enclosure occupies minimal space in your work area

The compact design, small footprint and sleek finish make this enclosure the perfect desktop companion for your Mac or PC.

Requiring only 5V of power, you have the option to power the enclosure through USB alone, without the need for an external power adapter. It can be powered through a single or two USB sources, such as USB chargers or ports on your laptop, depending on your drive set-up. In stationary applications or configurations where more power is desired, a power adapter is included.  The enclosure gives you a convenient, energy-efficient storage solution with flexible storage set-up options - and easy portability.

Increased performance and data redundancy with RAID

Enjoy peace of mind, knowing your files are continually backed up or take advantage of greater speed and capacity offered with a combined solution. The enclosure supports RAID 0, 1, Spanning, and JBOD, enabling you to choose your preferred backup mode. With the convenience of RAID, you can achieve increased size, performance, or redundancy.

The enclosure is compatible with Windows®, Mac®, Chrome OS™ and Linux® systems without having to install additional drivers or software.

Enhanced performance through UASP

This high-performance SuperSpeed USB 3.0 enclosure supports data transfer rates of up to 5Gbps and is enhanced with UASP support, which can deliver ~70% faster read speed and 40% faster write speed over traditional USB 3.0, when paired with a UASP-enabled host.

UASP speed benefit diagram

Note: UASP (USB Attached SCSI Protocol) is supported in Windows 8, 8.1, Server 2012 and Linux kernel 2.6.37 or later. Test results were obtained using an Intel® Ivy Bridge system, StarTech.com add-on USB 3.0 cards, a UASP-enabled StarTech.com enclosure, and a SATA III solid state drive.

The S252BU33R dual-bay enclosure is ruggedly built to deliver long-lasting performance, and is backed by a StarTech.com 2-year warranty and free lifetime technical support.

Applications

  • Increase the external storage capacity of any computer by connecting this external storage enclosure
  • Take it with your laptop for on-the-go external storage
  • Add the security of data redundancy by using this enclosure with support for RAID
  • Backup or archive data from any USB computer

The StarTech.com Advantage

  • Provides high capacity and high performance external storage
  • Looks great next to your computer with a sleek, compact design
  • Increases storage performance with RAID and UASP

Partner Numbers

  • Ingram Micro España V933434
  • UPC 065030860437

Compatibility

  • OS Independent logo
OS independent; No software or drivers required

Specifications

Warranty Information Warranty 2 Years
Connector(s) 1 - Drive Connectors SATA Data & Power Combo (7+15 pin)
1 - Host Connectors USB Type-B (9 pin) USB 3.0
Environmental Operating Temperature 0°C to 40°C (32°F to 104°F)
Storage Temperature -10°C to 65°C (14deg;F to 149°F)
Humidity 10~90% RH
Hardware Interface USB 3.0
Bus Type USB 3.0
Number of Drives 2
Drive Size 2.5in
Compatible Drive Types SATA
Drive Installation Fixed
Number of 2.5 inch bays 2
Supported Drive Height(s) 5mm
Fan(s) Yes
Supported Drive Height(s) 7mm
1 - Fans 40 mm
Supported Drive Height(s) 9.5mm
Fan Bearing Type Ball Bearing
Supported Drive Height(s) 12.5mm
Chipset ID JMicron - JMS561
Supported Drive Height(s) 15mm
Indicators 1 - LED Indicators Power LED
HHD 1 Activity LED
HHD 2 Activity LED
Packaging Information Package Height 10.9 cm [4.3 in]
Package Length 18.2 cm [7.2 in]
Shipping (Package) Weight 730 g [25.8 oz]
Package Width 11.9 cm [4.7 in]
Performance Maximum Data Transfer Rate USB 3.0 - 5 Gbps
Type and Rate USB 3.0 - 5 Gbit/s
UASP Support Yes
4Kn Support Yes
Type and Rate SATA III (6 Gbps)
Hardware Raid Supported Yes
Supported RAID Modes RAID 0 (Striped Disks)
Max Drive Capacity Currently tested with up to 2TB 7200 RPM hard drives (4 TB total)
Hot Swap Capability Yes
Supported RAID Modes RAID 1 (Mirrored Disks)
JBOD - (Just a Bunch of Disks)
BIG (Spanning or Concatenation)
Noise Level 21 dBA
Physical Characteristics Color Black
Material Aluminum and Plastic
Max Drive Height 15 mm [0.6 in]
Product Length 13.2 cm [5.2 in]
Product Width 50 mm [2.0 in]
Product Height 90 mm [3.5 in]
Weight of Product 350 g [12.4 oz]
Power Power Source AC Adapter Included
Input Voltage 100 - 240 AC
Input Current 0.4 A
Output Voltage 5 DC
Output Current 2 A
Plug Type H
Power Consumption (In Watts) 3
Software OS Compatibility OS independent; No software or drivers required
What's in the Box 1 - Included in Package USB 3.0 Dual 2.5” SATA HDD/SSD RAID Enclosure
USB 3.0 cable
USB to Power Cable (Type H Barrel)
Universal Power Adapter (NA/EU/UK/AU)
Installation screw kit
Quick install guide

Accessories

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3m Black SuperSpeed USB 3.0 Cable - Right Angle A to B - M/M

Connect USB 3.0 devices, even in hard to reach areas and tight spaces

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Connect to your external solutions and transfer data at 10x the speed of USB 2.0

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Connect USB 3.0 devices, even in hard to reach areas and tight spaces

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€10.88 EUR incl. VAT
USB3CAB1M

1m (3ft) Certified SuperSpeed USB 3.0 A to B Cable - M/M

Connect your USB 3.0 devices with this high-quality USB 3.0 certified cable

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€13.30 EUR incl. VAT
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2m Black SuperSpeed USB 3.0 Cable - Right Angle A to B - M/M

Connect USB 3.0 devices, even in hard to reach areas and tight spaces

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€4.83 EUR incl. VAT
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2m (6 ft) Certified SuperSpeed USB 3.0 A to B Cable - M/M

Connect your USB 3.0 devices, with this high-quality USB 3.0 certified cable

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€16.93 EUR incl. VAT
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€8.46 EUR incl. VAT
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Extend your USB 3.0 SuperSpeed cable by up to an additional 6 feet

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€12.09 EUR incl. VAT
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10m USB 3.0 Active Extension Cable - M/F

Extend the distance between a computer and a USB 3.0 device by an additional 10 meters

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Firmware

Manual(s):

Datasheet

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Frequently Asked Questions

Troubleshooting

When you troubleshoot issues with a hard drive enclosure, there are some quick tests that you can complete to rule out potential problems. You can test to make sure that the following components are working correctly and are not the source of the issue:

  • Cables
  • Hard drives
  • Hard drive enclosure

To test your setup components, try the following:

  • Use the cables, hard drives, and hard drive enclosure in another setup to see if the problem is with the components or the setup.
  • Use a different cable, hard drive, and hard drive enclosure in your setup to see if the problem persists. Ideally, you should test a component that you know works in another setup.

When you test the hard drive and hard drive enclosure, it is recommended that you do the following:

  • To check Disk Management, press the Windows key + R, type diskmgmt.msc, and press Enter. Check to see if your hard drive is listed.
  • If the hard drive is listed with unallocated space, the hard drive needs to be reformatted. Right-click unallocated and click New Simple Volume. Follow the on-screen instructions to complete the reformatting.​

Note: Formatting a hard drive erases all of the data on it. Make sure that you back up all of your data before you reformat the hard drive.​

  • If the hard drive is listed as healthy but does not have a drive letter, for example, C:, right-click healthy and click Change Drive Letter and Paths. Click Add, assign a drive letter, and click OK.

Note: A formatted hard drive will not show up in Computer or My Computer until it has a drive letter assigned to it.

Note: Any data currently on the drives will be lost during this process. You need to back up all of your data before you set a RAID mode.

To set a RAID mode, complete the following:

  1. Turn off the hard drive enclosure.
  2. Set the RAID dip switches to the RAID mode that you want to set. 
  3. Turn on the hard drive enclosure.
  4. Press and hold the Set button until the power LED turns red and the HDD1 and HDD2 LEDs start blinking.

In order to rebuild a RAID array, you need to replace a physical drive with an identical drive on the same RAID controller. Although standard RAID levels are generally agreed upon throughout the industry, the implementation varies between manufacturers. RAID arrays are typically not accessible when they are moved to another controller, and data may be unrecoverable if the drives are out of order or have been formatted or accessed by another RAID controller.

If a RAID controller has failed, you should get the exact same model of RAID controller.  

Note: If a drive or drives were damaged, it is possible that the RAID array may be permanently unrecoverable.

RAID should not be considered a replacement for backing up your data. If critical data is going onto a RAID array, you should back up the data on another physical drive or logical set of drives.

Rebuild a RAID array

With the following RAID modes, recovery is possible using the same StarTech.com product. Refer to the following table for the appropriate method to use to recover your RAID array.

RAID mode Max # of failed drives Procedure
RAID 1 Only one drive is needed for recovery.
  1. Determine which drive is operational by using the RAID management utility (if available) or test each drive individually on a different hard drive controller (for example, a hard drive docking station or SATA controller).

  2. Replace the failed drive with an identical hard drive.

The array will rebuild and is accessible during the rebuilding process.

RAID 3 Single drive failure will rebuild.
  1. Determine which drive is defective by using the RAID management utility (if available) or with diagnosis LEDs on the controller or enclosure.

  2. Replace with an identical hard drive.

Note: Do not change the order of the drives.

  1. The array may be accessible during the rebuild, but you should let the controller rebuild without interruption so that performance is not compromised.

RAID 5 Single drive failure will rebuild.
  1. Determine which drive is defective by using the RAID management utility (if available) or with diagnosis LEDs on the controller or enclosure.

  2. Replace with an identical hard drive.

Note: Do not change the order of the drives.

  1. The array may be accessible during the rebuild, but you should let the controller rebuild without interruption so that performance is not compromised.

RAID 10 Only one drive in a mirrored set can fail.
  1. Determine which drive is defective by using the RAID management utility (if available) or with diagnosis LEDs on the controller or enclosure.

  2. Replace with an identical hard drive.

Note: Do not change the order of the drives.

  1. The array may be accessible during the rebuild, but you should let the controller rebuild without interruption so that performance is not compromised.

 

You should not upgrade your device's firmware if you do not have any issues with the functionality of your device. The only time you should consider an upgrade is if you are experiencing a problem with the device, and you have confirmed that the firmware addresses this problem.  You can confirm this is the case by reviewing the documentation included with the firmware or by consulting with our Technical Support team. Incorrectly upgrading firmware can result in diminished performance so it is best to contact StarTech.com if you would like to perform this operation.

Before You Buy

To determine if your hard drive will work in this enclosure, on the product page, click the Technical Specifications tab, and do the following:

  • Make sure that the enclosure supports the storage size of your hard drive. If the storage size of your hard drive is larger than what the enclosure was tested with, the hard drive will likely still work with the enclosure.
  • Confirm that your hard drive uses the same interface type as the enclosure. For example, IDE, SATA, or M.2.
  • Make sure that the enclosure supports the physical size of your hard drive, such as 2.5 inches or 3.5 inches.
  • Make sure that the enclosure supports the height of your hard drive. For example, 9 mm or 15 mm.
  • Verify that the power consumption of your hard drive doesn’t exceed the power output of the enclosure. If you’re using multiple hard drives, make sure that the combined power consumption of all of the hard drives doesn’t exceed the power output of the enclosure.

Note: Not all StarTech.com devices support each of the RAID modes described below. For more information on the RAID modes that your device supports, refer to the manual or the StarTech.com product page.

Redundant Array of Independent Disks (RAID) is a virtual disk technology that combines multiple physical drives into one unit. RAID can create redundancy, improve performance, or do both.

RAID should not be considered a replacement for backing up your data. If critical data is going onto a RAID array, it should be backed up to another physical drive or logical set of drives.

The following are terms that are normally used in connection with RAID:

  • Striping: data is split between multiple disks.
  • Mirroring: data is mirrored between multiple disks.
  • Parity: also referred to as a checksum. Parity is a calculated value used to mathematically rebuild data.

Different RAID levels exist for different application requirements.

Refer to the following table for the list of RAID modes offered by some StarTech.com products:

RAID mode Description Operation Advantages Disadvantages Recovery
RAID 0 Striped disks Data is split evenly between two or more disks. Large size and the fastest speed. No redundancy. If one or more drives fails, this results in array failure.
RAID 1 Mirrored disks Two or more drives have identical data on them. A single drive failure will not result in data loss. Speed and size is limited by the slowest and smallest disk. Only one drive is needed for recovery.
RAID 3 Striped set with dedicated parity Data is split evenly between two or more disks, plus a dedicated drive for parity storage. High speeds for sequential read/write operations. Poor performance for multiple simultaneous instructions. A single drive failure will rebuild.
RAID 5 Striped disks with distributed parity Data is split evenly between three or more disks. Parity is split between disks. Large size, fast speed, and redundancy. The total array size is reduced by parity. A single drive failure will rebuild.
RAID 10 1+0; Striped set of Mirrored Subset Four or more drives are made into two mirrors that are striped. Larger size and higher speed than RAID-1, and more redundancy than RAID-0. No parity. Only one drive in a mirrored set can fail.
JBOD Just a Bunch Of Disks Any number of drives are accessed independently by the operating system. Software RAID modes can be used. Hardware RAID may have better performance. N/A
Big Spanning or Concatenation Data is written on one drive until it is full, and then the next drive(s) until it or they are full. Creates a very large and simple array.

No redundancy.

N/A
Clone RAID 1 + Spare

Two drives have identical data, plus one drive is used for rebuilding in case of a primary array failure.

Seamless operation when one drive fails in a RAID-1 array. Spare drive is not accessible to the user. Only one drive is needed for recovery.

 

Compliance and safety

Compliance letters

  • WEEE
    • Language: English
  • RoHS
    • Language: English

Safety Measures

  • If product has an exposed circuit board, do not touch the product under power.
  • If Class 1 Laser Product. Laser radiation is present when the system is open.
  • Wiring terminations should not be made with the product and/or electric lines under power.
  • Product installation and/or mounting should be completed by a certified professional as per the local safety and building code guidelines.
  • Cables (including power and charging cables) should be placed and routed to avoid creating electric, tripping or safety hazards.
*Product appearance and specifications are subject to change without notice.

Customer Reviews

(5 reviews)
3.6 out of 5 stars
  • 5 (2)
  • 4 (1)
  • 3 (1)
  • 2 (0)
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1 - 5 of 5 Reviews
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(5 Stars)

By: DrZiodberh - 02/22/2016
A really nice compact and very reserved design. This is the only drive enclosure I could find that fit 2.5" HDDs and SSDs, with SATA 3 and USB3. Very please with this, coupled with two WD red dives it very fast and runs very cool. The only improvement I would make would be to add a quick release/open latch rather than screw entry.
| Helpful?
(3 Stars)

Great Drive But Doesn't Work with 5TB 2.5" Drives

By: Richard108 - 05/11/2018
I bought this last week. It's a nice case - compact, light, bus-powered, USB 3.0, takes 15mm 2.5" drives - exactly what I was wanting. Alas, it does not work with 5TB Seagate Barracuda 2.5" drives - and this was not obvious on the Amazon product page. I realise now that it has only been tested with 2TB drives. Gutted! Will there be a firmware update for it that will allow it to use 5TB drives?? I hope so!
| Helpful?
Sam, Customer Support on 5/15/2018 12:52:47 PM
Thank you for your review of S252BU33R. Although it has only been tested with drives up to 2TB, we don't expect any issues using this enclosure with larger drives. We recommend contacting us directly so that we can find out the problem and get your setup working as quickly as possible. You can reach our Technical Advisors 24 hours a day, 5 days a week, at 1-800 265-1844 or www.startech.com/chat.
(4 Stars)

Great Enclosure

By: MattMerz - 05/18/2018
I use it with MacOS 10.13.4 in RAID mode for TimeMachine Backup. Works great. Unfortunately no firmware updater for MacOS X available :-(
| Helpful?
(1 Stars)

Painfully slow with RAID 0

By: tomb - 05/24/2018
Bought this enclosure to use as a RAID 0 large storage option. Unfortunately it is slower than the base drives by an order of magnitude (14-16MB per second throughput). do not purchase it if you are going to use it for RAID 0.
| Helpful?
Sam, Customer Support on 5/24/2018 4:04:20 PM
Thank you for your feedback on S252BU33ER. We're sorry for the slow speeds you're seeing and would like to help. There are some factors that could affect how fast your transfers go including how the data is being written on the drives, other operations going on your computer, the speed of the USB port the enclosure is connected to, and others. This, however, may not account for the speeds you're seeing. We recommend contacting us directly so that we can find out the problem and get your setup working as intended as quickly as possible. You can reach our Technical Advisors 24 hours a day, 5 days a week, at 1-800 265-1844 or www.startech.com/chat.
(5 Stars)

Works great

By: Neve - 01/15/2019
Have owned this device for several years, and it just works. I'm extremely happy with this product.
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